20531395 has 4 divisors (see below), whose sum is σ = 24637680. Its totient is φ = 16425112.

The previous prime is 20531353. The next prime is 20531417. The reversal of 20531395 is 59313502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20531395 - 2¹³ = 20523203 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053135 + ... + 2053144.

It is an arithmetic number, because the mean of its divisors is an integer number (6159420).

Almost surely, 2^20531395 is an apocalyptic number.

20531395 is a deficient number, since it is larger than the sum of its proper divisors (4106285).

20531395 is an equidigital number, since it uses as much as digits as its factorization.

20531395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4106284.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 20531395 is about 4531.1582404502. The cubic root of 20531395 is about 273.8248254275.

Adding to 20531395 its reverse (59313502), we get a palindrome (79844897).

The spelling of 20531395 in words is "twenty million, five hundred thirty-one thousand, three hundred ninety-five".